INJECTOR AS 4711845 - Caterpillar

Ensure that the engine cannot be started while this maintenance is being performed. To help prevent possible injury, do not use the starting motor to turn the flywheel.Hot engine components can cause burns. Allow additional time for the engine to cool before measuring/adjusting valve lash clearance.
Only qualified service personnel should perform this maintenance. Refer to the Systems Operation/Testing and Adjusting Manual, "Valve Lash and Valve Bridge Adjustment" article or consult your Caterpillar dealer for the complete valve lash adjustment procedure.Operation of Caterpillar engines with improper valve adjustments can reduce engine efficiency. This reduced efficiency could result in excessive fuel usage and/or shortened engine component life.
Note: Any air lines that are disconnected during a valve lash adjustment must be plugged to protect the engine. Prevent the entry of airborne dirt, debris, and abrasive particles. Keep all parts clean from contamination. Contaminants may cause rapid wear that shortens the component life.